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List:       owfs-developers
Subject:    Re: [Owfs-developers] RE: Usbdevfs_bulk failed ep 0x83 len 1 ret -75
From:       Paul Alfille <palfille () earthlink ! net>
Date:       2005-04-24 16:55:52
Message-ID: 200504241255.53260.palfille () earthlink ! net
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You are very gracious.

I googled "usbdevfs_bulk libusb" and found many similar error reports, for 
everything from sane to mice. The problems seem to have started after the 
2.6.5 kernels and there is one suggestion is that the driver doesn't handle 
electrical noise on the USB interface well. All this seems to agree with your 
findings. It also means that the error should go away with kernel development 
in the furture.

Thanks for the report, and the followup!

Paul

On Sunday 24 April 2005 01:52 pm, Hans Parkmann wrote:
> Hi Paul,
>
> first of all I have to thank you again, you helped me so much and you
> put so much work in the owfs, you are great!
>
> My electronic skills are still very basic, but I think the problem has
> to do with the flouros and not with owfs itself, I did some research and
> foud out that the radiation of the flouros can have negative effects on
> chips and electric components near them.
>
> I installed a capaciator on the flouros 220V lines and moved the PCB
> further away from the flouros ballast. This seems to reduce or even
> eliminate all failures so I dont think its really a owfs problem, more
> an electro smog problem.
> A fancy grounded metal case should solve the problem finally.
>
> I am almost sure that radiation causes the problem, for testing i have
> put some ungrounded aluminium foil around the heatshrinked DS18B20 and
> have held it close to the flouros, the BUS broke down and could not be
> restarted until a complete reset was made (The DS9094 could not be
> initialised correctly anymore).
>
> I will do a 24 hour test now and see if seperation of the components
> will do the trick.
>
> I wonder what happends when I hook up the 400W HPS lamp for the big
> terrarium, hope the radiation doesnt melt all chips within 5 meters
> distance.
>
> My next project will be a valve amp, I definately need more basic
> electronic knowledge.
>
> Paul, thanks again for all your help, I admire your work, you are great!
> Simon
>
>
>
>
>
>
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